Portable electrically-driven drilling apparatus



PATENTED JAN. 19, 1904. G. P. CAMPBELL & S. T: ISHERWO0D.-

PORTABLEBLEGTRICALLY DRIVEN DRILLING APPARATUS.

APPLICATION FILED NOV. 26, 1901.

H0 MODEL.

2 SHEETSS Nd. 749,841. PATENTED JAN. 19, 1904. G. F. CAMPBELL & S. T. ISHERWOOD. PORTABLE ELEOTRIGALLY DRIVEN DRILLING APPARATUS.

APPLICATION FILED NOV. 26, 1901.

2 SHEETSSHBET 2.

I NO MODEL.

Ami;

w A w m w UNITED STATES Patented January 19, 1904.

PATENT QFFICE.

GEORGE FREDERICK CAMPBELL AND STANLEY THOMAS ISHERVVOOD, OF BOOTLE, NEAR LIVERPOOL, ENGLAND.

PYORTABLEV'ZELECTBICALLY-DRIVEN DRILLING APPARATUS.

SPECIFICATION forming part of "LettersPatent No. 749,941, dated January '19, 1904.

.- Application filed November 26,1901. Serial No. 83,721. (No model.)

To all whom It may concern.-

. .Be it known that we, GEORGE FREDERICK CAMPBELL and STANLEY THOMAS ISHERWOOD, subjects of-the King .of Great Britain, residing in Bootle, near Liverpool, in the county of Lancaster, England, have invented certain new and useful Improvements in Portable Electrically-Driven Drilling Apparatus, of

which the following is a specification.

We will describe our present invention with reference to the accompanying drawings, in which g Figure I is anelevation of the general ar- 1 rangement of one form of our apparatus. Fig.

II is a plan of Fig. I. Fig. III is a sectional elevation on line D D D of Fig. IV of an en 7 larged detail view of the drill-head and short extension shaft. Fig. IV is a sectional plan of Fig. III.

" the'usualdrillespfi 14 and feedingscrew Throughout the drawings similar parts are indicated by the same reference characters.

We mount the motor 1 on two horizontal trunnion-bearings 2, carried in a bracket 3, adapted to pivot relatively to the truck 4, about a vertical axis A A, the base 6 of the bracket being steadied on the truck by means of a circular race 7, upon which it rides. -Where the motor is to be slung, the trunnions are carried in an encircling bow and form the horizontal axis, the'supportingchain or rope providing for the movement about the vertical axis. l

9 In the particular form of drill we are now describing the speed reduction from the motor-shaft 8 to the drill head is effected in the following manner: On one end of the motorshaft 8 we fix a pinion 9, which gears into a spur-wheel 10, mounted on a hollowshaft 11, preferably carried on the casing of the motor 1. A; length of shafting 12, keywayed at'41 for the greater portion of its length, is adapted to move axially through the hollow shaft 11, .the latter being provided with a fixed key which'slides in the keyway 4110f the shaft 12 and by means of which the hollow shaft drives the sliding shaft. The drillehead 13 comprises provided with-a hand-wheel 49 for regulating the feed. A short length of shaft 16, sheathxed lar, as in the usual arrangement.

in the tube 17, forming part of the frame of the head, is adapted to form an extension of the shaft 12 and be secured to it by means of the coupling 18.

The respective ends of the sliding shaft 12 and short shaft 16 are coned male and female, and the coned endof the shaft.12 is also provided with a feather 43, the two coned parts being forced into frictional contact and the feather 43 held in its keywav by the nut 19.

Secured to the other end of the shaft 16 is a bevel-pinion 20, gearing into the large bevelwheel 21, which is in turn attached by setscrews 44 to one of a pair of miter-wheels, 22,

the other, 23, being secured to the drill-socket spindle 24. The frame of the head is branched from the tube 17 to form two bearings 25 25, carrying two studs 49 and 45, which screw into the cross-piece 27 and allow of the drill being almost completely rotated about their common axis B B, the stud 49 also forming a spindle upon which the coupled wheels 21 22 rotate. The cross-piece 27 is made integral with the spindle-socket 28. A set-pin engaging in a groove 29, turned in the spindle 24, retains the latter in place. It will thus be seen that the rotation of the motor-shaft 8 is conveyed to the drill-socket 14 through the pinion 9 and spur-wheel 10, the hollow shaft 11, sliding shaft 12, and extension-shaft 16, bevel-wheels 20 21, and miter-wheels 22 23.

The end thrust of the drill-spindle is taken on two convex surfaces 30, of hardened steel, on the drilling center; line instead of on a col- The necessary abutment for the feed-screw is provided at 31, and a controlling-switch 32 is mounted on the drill-head and connected up to the motor through leads 42. It will be seen that this form of apparatus admits of five distinct motions. The motor as. a whole may be rotated on thetrunnions 2about.the horizontal axis C C and on the circularirace 7 about the vertical axis A A. The shaftg12' is capable of sliding axially throughthe hollow shaft 11, and the drillr'nay be rotated about the axis D D'and partially about the axis B B. The

axes about which the motor and the drill-head may rotate being. in each case in planes at right angles to each other give in combination with the sliding motion of the shaft 12 a very considerable range of adjustment.

Having now fully described our invention, what we claim, and desire to secure by Letters Patent, is

In combination with a shaft 12, a frame swiveled on the end of this shaft, studs 19 and 45 extending from said frame inwardly toward each other and screw-threaded at their inner ends, a spindle-socket having a crosspiece into which the inner ends of the studs are screwed, a spindle carried by the spindlesocket, a gear on the said spindle, a gear turning loosely on the plain part of stud 49 5 and a gear connection therefrom to the shaft 12, substantially as described. I

In testimony whereof we have hereunto set our hands in the presence of two subscribing Witnesses,

GEORGE FREDERICK CAMPBELL. STANLEY THOMAS ISHERWOOl).

Witnesses:

J. E. LLOYD BARNES, J. E. Hms'r. 

